The calculated distance (air line) between Saalfelden am Steinernen Meer and Mödling is approximately 166 miles respectively 267 kilometers.
By car or train, the actual journey to Mödling is certainly longer, as only the direct route (as the crow flies) between Saalfelden am Steinernen Meer and Mödling has been calculated here.
Air line (approximately)
267 kilometers
144 nautical miles